puma/puma

test/rackup/sleep_pid.ru

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# call with "GET /sleep<d> HTTP/1.1\r\n\r\n", where <d> is the number of
# seconds to sleep, returns process pid

run lambda { |env|
  dly = (env['REQUEST_PATH'][/\/sleep(\d+)/,1] || '0').to_i
  sleep dly
  [200, {"Content-Type" => "text/plain"}, ["Slept #{dly} #{Process.pid}"]]
}